# ControlNotificationStream.drop(while:)

- **Module:** ControlNotificationStream
- **Package:** libtmux-swift
- **Language:** Swift
- **Kind:** method
- **Page:** https://libtmux.org/reference/swift/controlnotificationstream-drop(while-)/

```
ControlNotificationStream.drop(while:)(while: (Self.Element) async -> Bool) -> AsyncDropWhileSequence<Self>
```

Omits elements from the base asynchronous sequence until a given closure returns false, after which it passes through all remaining elements.

Use `drop(while:)` to omit elements from an asynchronous sequence until
the element received meets a condition you specify.

In this example, an asynchronous sequence called `Counter` produces `Int`
values from `1` to `10`. The `drop(while:)` method causes the modified
sequence to ignore received values until it encounters one that is
divisible by `3`:

    let stream = Counter(howHigh: 10)
        .drop { $0 % 3 != 0 }
    for await number in stream {
        print(number, terminator: " ")
    }
    // Prints "3 4 5 6 7 8 9 10 "

After the predicate returns `false`, the sequence never executes it again,
and from then on the sequence passes through elements from its underlying
sequence as-is.

- Parameter predicate: A closure that takes an element as a parameter and
  returns a Boolean value indicating whether to drop the element from the
  modified sequence.
- Returns: An asynchronous sequence that skips over values from the
  base sequence until the provided closure returns `false`.